> I asked a week or so ago what restrictions, if any, there were on community
> strings and didn't see an answer. I've since poked around the MIBs and
> such and believe I've determined that a community string is a 256-octet
> string.
I don't believe there are any explicit restrictions on a community string
in the SNMP specs themselves, but some MIBs make certain assumptions
about such strings.
For example, RMON-MIB::eventCommunity is defined as
(OCTET STRING (SIZE (0..127))
and NOTIFICATION-LOG-MIB::nlmLogContextName as
SnmpAdminString i.e. a printable OCTET STRING (SIZE (0..255))
It may also be used as (part of) a table index, in which case the whole
thing must be shorted than 127 subidentifiers.
> That is, it can be up to 256 8-bit characters including, in the extreme,
> nul, Unicode, etc. So, I tried things like:
>
> Foo$Bar & Grill
>
> and
>
> #<b>Hi!</b>
>
> These strings look find in my snmpd.conf:
>
> # rocommunity: a SNMPv1/SNMPv2c read-only access community name
> # arguments: community [default|hostname|network/bits] [oid]
>
> rocommunity Foo$Bar & Grill
>
> # rwcommunity: a SNMPv1/SNMPv2c read-write access community name
> # arguments: community [default|hostname|network/bits] [oid]
>
> rwcommunity #<b>Hi!</b>
>
> but my clients time out:
>
> snmpget -v 2c -c 'Foo$Bar & Grill' myserver system.sysDescr
> Timeout: No Response from myserver.
My *guess* is that it's probably the config file parsing that's
getting confused. Try running the agent with '-Dread_config'
and/or '-Dnetsnmp_udp_parse_security' and watch what gets set up.
You may also need to run the agent under the debugger, and look
at the contents of the com2sec mappings.
Dave
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